FREE Airframe Mechanic Sheet Metal Structures Questions and Answers

Question 1

When fabricating a 90-degree bend in a piece of aluminum sheet metal with a radius of 0.125 inches and a thickness of 0.063 inches, what is the setback?

Accepted Answer

0.188 inches

Answer

0.125 inches

Answer

0.063 inches

Answer

0.251 inches

Question 2

An aircraft's aluminum skin shows signs of fine, worm-like lines of corrosion products beneath the paint film, particularly in a high-humidity environment. Which type of corrosion is most likely present?

Accepted Answer

Filiform corrosion

Answer

Pitting

Answer

Intergranular corrosion

Answer

Stress corrosion cracking

Question 3

During a repair of a stressed-skin structure, a small crack is found. What is the first procedural step to stop the progression of the crack before applying a patch?

Accepted Answer

Drill a small hole at each end of the crack.

Answer

Rivet a patch directly over the crack.

Answer

Apply a sealant to the crack.

Answer

Blend out the crack using an abrasive pad.

Question 4

What does the 'AD' in the rivet identification code AN470AD4-5 signify?

Accepted Answer

The material is 2117-T aluminum alloy.

Answer

The head style is countersunk.

Answer

The material is 5056 aluminum alloy.

Answer

The rivet requires refrigeration.

Question 5

A technician is performing a flush patch repair on a pressurized fuselage skin. How should the thickness of the doubler and the filler (patch) relate to the original skin thickness?

Accepted Answer

The doubler should be one gauge thicker, and the filler should be the same thickness as the original skin.

Answer

The doubler and filler should both be one gauge thicker than the original skin.

Answer

The doubler should be the same thickness, and the filler should be one gauge thinner than the original skin.

Answer

The doubler and filler should both be the same thickness as the original skin.

Question 6

Which of the following is considered a major repair to an airframe sheet metal structure according to 14 CFR Part 43, Appendix A?

Accepted Answer

The repair of damaged areas in stressed covering exceeding six inches in any direction.

Answer

Making a small patch not changing the contour.

Answer

Repairing upholstery of the cabin interior.

Answer

Replacing a side window that does not interfere with the structure.